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M L BOSWORTH CHEMICAL FIRE EXTINGUISHBB.

No. 515,460. Patented Feb. 27 1894.

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PATEN MARTIN L. BOSWORTI-I, OF WARREN, RHODE ISLAND.

CHEMICAL FIRE- EXTINGUISHER.

SPECIFICATION formingpart of Letters Patent No. 515,460, dated February 27, 1894.

Application filed August 29, 1892. Serial No. :443 N modem To all whom, it may concern.-

Be it known that I, MARTIN L. Boswonrn;

of the town of Warren, in the county of Bristo], in the State of Rhode Island, have invented a certain new and useful Improvement in Chemical Fire-Extinguishers; and I declare the following to be a specification thereof, reference being bad to the accompanying drawings.

Like letters indicate like parts.

Figure 1 is a View of my improved fire-extinguisher in dialnetrical, vertical section on line as a: of Fig. 2. Fig. 2 is a bottom plan view of my invention.

My invention is an automatic extinguisher for fires, and relates to the class of chemical fire-extinguishers, having a tank to contain water and means to discharge the same, and also having, within said tank, a breakable vessel or receptacle to contain a chemical substance, which is discharged into the water, when said vessel is broken, thereby charging the water with carbonic-acid gas.

My invention consists in the combination of parts and the construction of the device, as hereinafter particularly specified and as set forth in the claims.

A is a tank, preferably made of sheet metal and cylindrical in shape; but it may be made of any suitable material and in any other suitable form. It has a screw threaded cover B fitting upon a neck 03. It is suspended by .abail C, fastened at b and is hung upon a hook from the ceiling of a room, or otherwise properly supported in place; A central, open tube D extends up through the bottom 0 of the tank to a considerable height within the tank. Pipes E E extend up within the tank A from a point near the bottom thereof, are bent near the top of the tank and pass out and down outside the tank and enter discharging pipes F, which are perforated as shown. An annular, flanged shelf G is supported with the tank by the braces d. A bottle H, of glass or other fragile material, rests upon said annular shelf. A collar or ring I, held by braces e, surrounds the neck of the bottle, so as to prevent its vertical displacement upon said shelf.

On the bottom 0 of the tank, upon the under side thereof, are lugs m. A hammer J is pivotally mounted in said lugs and its end or head extends to a central position beneath the tank, as shown. A spiral or other spring n properly mounted, gives to the hammer a forcible upward movement when the latter is free to move and a block 3, extending from the bottom of the tank A, serves as a'stop to limit the upward travel of the hammer when the latter is actuated by the spring.

A plunger K, having a head 0, extends through the tube 1). The head 0 of the plunger rests upon the upper end of said tube and the bottom of the plunger rests upon the upperplane surface of the head of the hammer J. The plunger head 0 is below and in close proximity to the bottom of the bottle H, the annular shelf G, by its central aperture, exposing the bottle to the action of the plunger, as hereinafter described.

A seat 13, of metal, is secured to the upper surface of one of the discharge pipes F and is adapted to receive the convex or lower surface of the hammer-head. The hammer is depressed, against the action of the spring 02, to the position indicated in Fig. l by dotted lines, and the spring n is thereby expanded. The hammer-head is then soldered to said seat 19 by a soft solder, fusible at a comparatively low temperature, say 140, and the hammer is thus permanently fastened in the position shown by the dotted lines.

The tank A is filled with water to a proper height and the bottle is filled with the chemical substance, which generates the carbonicacid gas. The device, being now ready for operation whenever the circumstances require, is hung by the bail upon any desired support in the apartment which is to be protected from fire. When a fire occurs in the apartment, as soon as the air in the room is heated to the degree at which said solder is fusible, the solder is melted and the hammer J, being no longer able to resist the action of the spring or, is drawn upward by the spring with great force and strikes against the lower end of the plunger K, thus driving the plunger upward within the tube D. The hammer is arrested in its upward travel by the stop 8, which blow is communicated by the momentum of the plunger so caused to the bottom of the fragile receptacle H and breaks it. When the momentum of the plunger in its upward travel is expended by the breakage U of {he bait-1e thereby, the plungerdropsagain yilts welghtdown-into the tubehntil' pre-v vented from further descent by the heado 7 thereof coming into 'contachwith the: upper open endof said tube. The collar-Iseryesto 7 hold downihcbotile l-I apQuiheshelf QsQ; that thebottleisuot displaced by the blow 7 f the plunger K; but-must, be broken; thereby.

y ,The Waterihus chargedwi'th carbonic acidgas escapes from the tank through the pipes 7 E iutqand out; of the perforated discharge ;P1pes:F and the fire'is quichlysmoihered and eximguished. The plunger K should-be ofa -suflicient length to strike a. free" blow upon V r The chemical substance, contained inth-e ves IQ 'sel B, then falls by its own weighhthrough V s the shattered 7 bottom of said vessel, intoishewaterbclow, in tho'tank; and carbonic-acid gas is thus generatedwhich causesthe efiervesceneeofi thewater and the gaseous press ureyas in other chemical fire extinguishers.

; the bottom of ihe' bottle-H; when it is hit by j the hammer {hand then to fall back by its I 1 weight upon ihc upper end of the tuba;

. :cbinai/iouwith the upperendof ,thcj tube D;

forms avalveyand- :is useful to'prevent the" The enlarged headoof theplnugcr, in comescape of thesgas; down 'th'rou'gh the tube-to the external atmosphere. Thegas and water W are. thus compelled to I force, their way out through thepipes'RF, and izhe water, charged 1' with gas, is deliveredin jeta'thus covering widerareao If desired; a packing may be a put on theplun'gerj beu'eath the -head o',-or upon the upper end of the tube D, to'close the deepening there moreeffectuallyr y I It is evident that viustead'of solder as a de iaining means to hold the hammer against the operation of the spring, any mechanical thermostat may be used to engage said ham mer, until the device is actuated by heat; as, also, that the hammer may be so constructed and located as to operate by gravitation, when it is released, instead of being actuated by a spring; but these modifications are mechanical-equivalentsc t the eiernentsabove specij fied and arewithin thesccpe ofmy invention;

PS0 far-as 1 amawaregI-am thefirst to pro" vide'a chemical fire-extinguisher with automatic devices to break the vessel, which holds thecheuiicalsubstance, and precipitate. the

' same 7 into thewater in theiankywhen{such n. I automatic devices are released by heat and are free to Work, I

I claim as" a noveland useful invention and odesirert'o secnre'byLettersPatent- :3 '1.2111achemical'fire-exiinguisher havmga tank,'discharge pipes andafragile receptacle:

for chemicals, the combination of the tube DJ o opening through the tank bottom, and the 6o I plunger: Kmountedandmovable in said tubehavingthc cover 13, the. central tube 13, the

forations,,the'annularshelf G and collar I supported in the tank bybraces d eythe fragile vessel H supportediu posit-ion byt-heshelf G 1 r and ring Lihe seat psecured' soone -of the "pipesFythe stop .3 extendingrfrom the bottom 'of-ihetank the hammeril, pivotally mounted" upon the :tauk, adapted :to enter theseat p and fastened therein by an easily fusible solder and provided with a spring 01,, all operating and substantially as and for the purpose specified.

MARTIN L. BOSWORTH.

WVitnesses:

DANIEL W. FINK, WARREN R. PERCE.

and provided with an enlarged head 'o,rwhioh Y r in conjunction: with the end of said tube is, adapted so serveas a valve, and a hammer amounted upon the iankaudadaptedio actnate the plunger substantialiyias au d'forihepurpose specified; I 2'. T-heimpro ved automatic fire-extinguish V 7 er herein deseribedconsisting'of the tank A 7 pinngcrK rmounted' and-movable 'inrsaidx utank and provided withavalvc or head 0,-th'e pipe-SE extending from I saidtube and open I I ing intothe "pipes l r th'epipes F having per: I a 

